I think you're confusing different factors, lumping them all under 'discipline'.
For instance, those 4th-and-long plays we gave up against Florida (and Oklahoma) in 2015 weren't discipline issues, so much as they were lack of depth. Our players were simply gassed by the 4th quarter, because we didn't have the quality depth to rotate in all game long. So they were tired out by the 4th.
Not discipline. Depth and conditioning.
Discipline is not playing your position. Is getting snagged for a costly rules violation, like the Foreman pass interference penalty in the end zone against Oklahoma a couple of years back.
Team 120 suffered a systemic lack of on-field discipline. But the teams before them, 119 and 118 in particular, were very well-disciplined teams on the field. Didn't one of them end the year as the least-penalized team in the SEC, and one of the best in the country in that stat?
So yeah, your mantra that Butch coaching = bad on-field discipline just isn't ringing true. Only really a consideration in the 2016 season.